Probably, some of you have tried buying cool but cheap products from Ebay. Like some of you, I also have bought items from Ebay several times already. One of the items that I got from Ebay is a small ENC28J60 based ethernet module.
As you can see from the image above, the ENC28J60 module is very small. The PCB is more or less one-inch square which is almost as small as the included ethernet jack.
I decided to make a simple sensor webserver using the ENC28J60 that I got from Ebay. I knew that there were already several sensor webserver projects posted on the internet but I couldn’t resist the temptation of making another one because I had a couple of sensors and an extra microcontroller lying around.
The simple sensor webserver is capable to measure temperature and relative humidity of a place or a room and deliver the data as a webpage to a request of a client. It is composed of a temperature sensor, a humidity sensor, an 8-bit microcontroller, and the ethernet module that I got from Ebay.
The temperature sensor that I used is LM35. It is a precision centrigrade temperature sensor that has an operating range of -55° to +150°C. The output of the sensor is connected to one of the ADC pins of the microcontroller.
For more detail: Simple Sensor Webserver
